<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by It's a Dry Heat:
Just testing I went to 93 oct and it went down to 11.5. I went back to 87 oct and mpg went back to 11.6. I'm at 11.7 mpg with my first shot of mobil one. <HR></BLOCKQUOTE>
This is general misconception that your engine will run better with higher octane gas. That is not true...for gas from gas pumps.
In order to increase the octane in gas we all buy from the gas station, ingredients are added to increase the octane. Those ingredients do not burn as efficiently, as normal 87 octane gas.
Now, if you're buying 113 Octane race fuel, or 120+ octane aircraft fuel, that's a whole different ball game. But of course, most people don't buy 55 gallon drums of 113 Octane race fuel at $4.60 per gallon.
The ONLY reason to buy high octane gasoline, is if you have a problem with knock/pinging (gas igniting slight before/after the optimal fire point). The higher octane and the less explosive ingredients are more stable and thus fire at the appropriate time.
If you don't have knock/pinging issues and you're buying high octane gas, you might as well flush the difference in the toilet.
Gas...why are we talking about gas, with Diesel H1's?
